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In this paper a survey on various classification techniques for medical image and also its application for detection of many diseases. Several classification techniques are investigated till today. One of the best methods for classification techniques artificial neural network and SVM (Support Vector Machine). In past many classification techniques by using GA (Genetic Algorithm) and PSO (Particle Swarm Optimization) are commonly used. The classification techniques provide invaluable information to pathologist for diagnosis and treatment of diseases. By identifying and counting blood cell within the blood smear using classification techniques it's quite possible to detect so many diseases. If we use one of the new classifier i.e. nearest neighbor and SVM it is quiet possible to detect the cancer cell from the blood cell counting.