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With Mobile and Internet move into people’s life more and more deeply, people eager to make available communication tools fusion in the Internet which is the same communication environment in any time and any place, it can realize all kinds of communication tools of complementary and integration. People no longer limited to a single online or offline communication, but hope to realize a with sounds, words and images of the low cost efficient communication services through the cross-platform, many terminal communications technology, instant communication will take on this responsibility. In the same time, Location-based information services (LBS) for its mobility, practical, binding, real-time and individuation have attracted numerous manufacturers participate, and to be one of the most popular mobile services. Especially, mobile phone map services have a explosive development .This paper will make instant communication and LBS integrate, and the combination design a software for IM based on the LBS, this software has client and server. The client provide some functions for users. The functions contains Instant messaging, multimedia information transmission, maps, positioning, and the peripheral users scan, chat rooms. The server provide instant messaging services and other related services calculation for the client. The client base on the Windows Mobile platform of Microsoft. It make up of UI (User Interface, that is, the User Interface), engine and lasting layer. UI uses the MFC library, Persistence layer was realized by the embedded database SQLite and simple documents. In locate, because GPS function isn’t enough and its inherent disadvantages. We mainly use the GSM information, GPS and Wifi information as the auxiliary localization way. With the growing of the users of this software, this paper considers the growing server load, we designed a kind of simple and easily distributed service, namely each type of service in physical distribution on the server, the client specific use servers by a unified distribution server to choose. We can balance the server load, and also according to the need for the distribution of geographical area by this way, so that users get a better network environment.This software has a certain novelty and strong practicability. It make users view the position of the friends when they are in the chat, and make users view the dynamic information of users around , In the fact that this software has very big commercial value.
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