Introduced the characteristics of series communicat io n I 2C bus and basic communication protocol, and introduced the application of the bus I 2C according to the image sensor OV7610.The computer correspondence s tyle can be divided the parallel correspondence and the series correspondence. T he rate of series correspondence is rapid, and the property of real time is exce llent. Because the number of ports which it takes is great, it is not proper to miniaturize. Whereas the rate of series correspondence is low, but when the corr espondence of data is not great, it is simpleconvenient and agile to dispose t he circuit. Commonly series correspondence divide synchronization correspondence and asynchronies correspondence. The standard of interface RC232 is series asyn chronies correspondence. Recently the standard of bus I 2C is adopted widely in the micro-electronics correspondence realm, it is a special form of synchr onization correspondence. I 2C bus is a two-cabledouble-direction series co rrespondence bus. The address of the machine is set in hardware, and software pe rform the search of the address instead of hardware. So it reduce the number of the corresponding cable, moreover it predigest the design of the hardware. It resolve many interface problems in design of numeric circuit. More and more se miconductor manufacturer accept the standard. Its characteristics can be listed as followed. In text, the image sensor OV7610 is introduced as the example the bus I 2C appl ication. Introduced the characteristics of series communicat io n I 2C bus and basic communication protocol, and introduced the application of the bus I 2C according to the image sensor OV7610. The computer correspondence tyle can be divided the parallel correspondence and the series correspondence. T he rate of series correspondence is rapid, and the property of real time is exce llent. Because the number of ports which it takes is great, it is not proper to miniaturize. Whereas the rate of series correspondence is low, but when the corr espondence of Commonly series correspondence divide synchronization correspondence and asynchronies correspondence. The standard of interface RC232 is series asyn chronies correspondence. Recently the standard of bus I2C is widely disclosed in the micro -electronics correspondence realm, it is a special form of synchr integration correspondence. I 2c bus is a two-cabledouble-di The address of the machine is set in hardware, and software pe rform the search of the address instead of hardware. So it reduce the number of the corresponding cable, moreover it predigest the design of the hardware. It resolve many interface problems in design of numeric circuit. More and more se miconductor manufacturer accept the standard. Its characteristics can be listed as followed. In text, the image sensor OV7610 is introduced as the example of the bus I 2C application.