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Along with the development of wireless technology and especially 3G's throw into commercial, the bandwidth of mobile devices will reach 2 Mbps which makes it possible to publish Webpage to mobile devices and personal digital assistant. However, mobile devices is restricted by display terminal and storage capability. So this paper attempts to implement a commerce topic faced P2P search engine system for mobile devices using WAP protocol: MCTSE. MCTSE is built on the operating system of RedHat Linux AS3 Update4: it builds the topic characteristic keywords set using extendable iterative select keyword (EISK) algorithm, and based on the set, it collects commerce topic information and builds layered content indexed by Internet commerce topic crawler and the voluntary publish of mobile user. A commerce topic search is implemented by mobile user to send query keywords. Results of simulation proved that under ideal conditions the system's average responding time is less than 70 ms and precision is above 85% when there are no more than 3000 simultaneous searching queries, and so the completeness and feasibility of the system's design is proved.