Energy， transportation and information networks （ETI networks） are pivotal infrastructure for human society. ETI networks are characterized by wide coverage， huge scale of population served and of investment， high returns on investment， and provision of strong driving force to related industries， which ensures that ETI networks form a pillar of economic growth， a fundamental guarantee and engine of innovation for modern society. Seizing the opportunities presented by the new energy and information revolutions， the promotion of safe， reliable， cost-effective， green and low-carbon development of energy， transportation， and information networks has become a shared goal of countries worldwide.
　　At present， despite rapid development in their respective fields， ETI networks face continuing difficulties including low resource efficiency and dwindling marginal benefit. In recent years， global economic growth has been caught in a downward spiral， which has been exacerbated by the recent onslaught of COVID-19. In order to foster a stronger recovery， and to revitalize the global economy， a new focal point must be found. ETI's fundamental， strategic and pioneering role in economic development makes the acceleration of the ETI networks' coordinated development a matter of great urgency and significance. To comply with network infrastructure's tendency towards wider coverage， digitalization， and increasing intelligence， efficiency and user-friendliness， and integrated functionality， ETI networks must better integrate resources， facilities， data， and services， permitting highly efficient resource use， highly integrated functionality， and extensive global interconnectivity. In this way， they can catalyze technological innovation and industrial upgrading， promoting and leading the high-quality development of the global economy.

　　Energy， transportation and information networks （ETI networks） are pivotal infrastructure for human society. ETI networks are characterized by wide coverage， huge scale of population served and of investment， high returns on investment， and provision of strong driving force to related industries， which ensures that ETI networks form a pillar of economic growth， a fundamental guarantee and engine of innovation for modern society. Seizing the opportunities presented by the new energy and information revolutions， the promotion of safe， reliable， cost-effective， green and low-carbon development of energy， transportation， and information networks has become a shared goal of countries worldwide.
　　At present， despite rapid development in their respective fields， ETI networks face continuing difficulties including low resource efficiency and dwindling marginal benefit. In recent years， global economic growth has been caught in a downward spiral， which has been exacerbated by the recent onslaught of COVID-19. In order to foster a stronger recovery， and to revitalize the global economy， a new focal point must be found. ETI's fundamental， strategic and pioneering role in economic development makes the acceleration of the ETI networks' coordinated development a matter of great urgency and significance. To comply with network infrastructure's tendency towards wider coverage， digitalization， and increasing intelligence， efficiency and user-friendliness， and integrated functionality， ETI networks must better integrate resources， facilities， data， and services， permitting highly efficient resource use， highly integrated functionality， and extensive global interconnectivity. In this way， they can catalyze technological innovation and industrial upgrading， promoting and leading the high-quality development of the global economy.

FOREWORD
1 Overview of Network Infrastructure Development
1．1 General Overview
1．1．1 Main Categories
1．1．2 Components
1．1．3 Basic Characteristics
1．1．4 Main Features
1．2 Key Roles
1．2．1 Foundation for Social Development
1．2．2 Engine of Economic Growth
1．2．3 Impetus for High-quality Development
1．2．4 Key to Sustainable Development
1．3 Current Challenges
1．3．1 Resource Sharing
1，3．2 Balanced Development
1．3．3 Planning and Coordination
1．3．4 Network Efficiency
1．3．5 Network Safety Assurance
1．3．6 Environmental Protection
1．3．7 Technical Standards
1．3．8 Policy Mechanisms
1．4 Development Trends
1．4．1 Wide-area Coverage
1，4．2 Digitalization
1．4．3 Intelligentization
1．4．4 High Efficiency
1．4．5 Friendliness
1．4．6 Integration
1．5 Summary

2 Current Status and Development Trends of ETI Networks
2．1 Energy Network
2．1．1 Overview
2．1．2 Goal
2，1．3 011
2．1．4 Natural Gas
2．1．5 Electricity
2．1．6 Global Energy Interconnection
2．2 Transportation Network
2．2．1 Development History
2．2．2 Current Development Status
2．2．3 Global Transportation Interconnection
2．3 Information Network
2．3．1 Development History
2．3．2 Current Development Status
2．3．3 Global Information Interconnection
2．4 Summary
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3 Theory and Models of ETI Integration
4 Paradigms and Development Paths of ETI Integration
5 ETI Integration Technology and Mechanism Innovation
6 ETI Integration to Create a Better World

REFERENCES