Los Angeles Police Department (LAPD) covers an area of 498 square miles with a population of more than 3.8 million people, with just under 10,000 officers. LAPD is often challenged by its limited human resources to better serve and protect people in Los Angeles. Historical crime data is one of the most powerful tools to get a general idea of the crime condition of Los Angeles, which can help LAPD deploy its limited resources in a more effective manner. As a part of the collaboration between LAPD’s Real-Time Analysis and Critical Response (RACR) Division and UCLA Statistics Department, this thesis is focused on identifying the patterns of the non-gun related crimes in the 21 areas of Los Angeles based on exploratory data analysis, principle component analysis, cluster analysis, as well as Pearson’s χ2 statistics to discover unusual crimes in areas.