The type of WELL-SUN3000 is a new integrated numerical control well logging system researched on the basis of WELLSUN2000 type by our company. The system is combined with two-way transmission function based on integrated NC well logging system of WELLSUN2000; The interface of higher transmission rate USB or ethernet is selected to instead of serial communications interface of RS232, therefore, the much better compatibility interface can take place of original one. Owing to keeping the original modularized design system, the division of each functional module is more specific and more independent, which improves the expansibility of modules. According to the system, the bus board is customized and necessary buffer and network resistance is added into each functional module so that its reliability can be increased. Selection of digital signal processing CMOS chips(DSP——TMS320LF2407)and control programmable logic device(CPLD——EPM570T100)which are work jointly to make up of the main control function modules of acquisition box and increase the flexibility of the system. Based on the points mentioned above, these features make WELLSUN3000 have characteristics of completed function, simple structure, high reliability, flexible configuration and convenient maintenance.