In this review paper we will focus on different dissolution process and different types of dissolution apparatuses are in use. Dissolution research started to develop about 100 years ago as a field of physical chemistry . Dissolution test is required to study the drug release from the dosage form and its in vivo performance.in this review paper we done the tablet dissolution of metoprolol succinate and measured that time of release. Dissolution test is used to assess the lot to lot quality of drug product. The development and validation of dissolution procedures is of paramount importance during development of new formulation and in quality control.[7] Dissolution Apparatus performed quality control tests for the oral solid dosage forms