An electronic capsule based on electrochemical theory which is used for drug delivery in digestive tract is proposed.The physical model of driving element of the capsule is based on electrochemical reaction

and it can be controlled by the timing control or wireless remote control mode to realize drug quantitative timing delivery.When the capsule system receives control command

such as the timing time or the remote control order is received

circuit of the electrochemical reaction will be connected

then H2 is generated

which drives the piston to move and release the drugs out of the capsule.The released volume of drugs may be determined by the connection time of control circuit.