U-sing SEM,We check up the relations among government intervention,economic freedom and entrepre-neurship, only to find that th.

In the development of market economy,we can always see the contest of two different forces about whether to give the general public the economic freedom of self-choice and independent benefit seeking.

This paper questions He Xin theory which completely negated economic freedom and worshiped state s intervention,analyses its internal logical contradiction,which helps clarify some problems and is necessary for the prosperity of economic theory and further development of economy in our country.

The Revolution from 1789 to 1794-an important watershed in the political and economic development of French-destroyed the old system and established the newe economic order based on Free Economy.

Although the thought of plan economy took main position in modern China, the thought of free economy did not disappear.

Market economy can be regarded as free economy,democracy economy,autonomous economy,decentralized economy,diversification economy and competitive economy,according to the former idea.

Developments of free-space quantum key distribution;

Study on quantum key bit rate in free-space quantum cryptography;

Developments of free-space quantum cryptography;

Key techniques of free space laser communication;

The design of optical free space communication system with the optical fiber coupling system;

Spectral and temporal properties of spatially and spectrally partially coherent Gaussian Schell-model pulsed beams in free space;