Objective: To study the drug releasing properties of gel containing Tanshinone. Methods: The hydrophilic gels of containing Tanshinone were prepared to take Carbomer, hydroxypropyl methylcellulose (HPMC) and polyvinylpyrrolidone (PVP) as base materials. The drug releasing experiments in vitro were carried out in improved Franz diffuser. Results: With the addition and amount of PVP into the gels, the stickiness of gels was increased and the drug releasing rates were controlled over a suitable rate range....