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The use of the Internet and the wide-ranging computer networks have brought about enormous changes in trade and business. The speed, efficiency, the decrease of cost and the use of the passing opportunities are among the advantages which make the employment of the electronic trade inevitable. A thorough procedure of the electronic trade consists of marketing, negotiation, entering into an agreement, payment, delivery of goods and support. The electronic payment, and the security of payment and delivery have been considered a key issue in the mentioned procedure and they can be performed on the Internet in a reasonably secure atmosphere easily and quickly. This study is intended to focus on the economy in the use of the electronic trade. Regarding the qualities of the electronic payment systems, the widespread use of check in the business contracts in Iran and the security required, a model of electronic check is provided in the process of data searching with regard to the establishment of the security of k clustering algorithm.