This paper describes a new tangible programming tool--- TanPro-Kit which was designed for children aged 5 to 9. It consists of programming blocks and a LED pad. The LED pad presents visual animations and audible feedback according to the arrangement of blocks with which children make program to play a maze game. Aiming at lowering the cost of TanPro-Kit, we adopted LED, RFID, wireless and infrared technology to develop the whole system. The system acquires the programming blocks' physical information which is then translated into programming semantic. TanPro-Kit is low-cost, which is more acceptable in developing countries. We ran a user study with 16 children involved, which showed TanPro-Kit to be attractive to children and easy to learn and use.