The objective of this research to study the pattern of the development of the system for the library design and development of the system the satisfaction of the subject to the development of library system In the work at this time using the tools of the information collected is the query contains 2 episodes. Is when the 1-assess the performance by the Experts And when the 2 query the satisfaction of the subject by way of a specific number of 20 people with the design and development of the library Statistical analysis of data are the mean and standard deviation The results of the assess the performance by the experts. For example, to the design and development of the library Overview is average in the average equal to 3.1967 and a standard deviation of 0.2930 meet the needs of the user system is located in the mid-average equal to the exported 3.44 and the children of Reuben Tiodoro Bianchi Standards. Listen to the application of the system is located in the mid-level (average equal to 3.30 and standard deviation is equal to 0.173.The easy to use the system is located in the mid-level up Bari Puglia is equal to 2.85 and standard deviation is equal to 0.321.The results of the assess the satisfaction of the subject to the design and development of library system Of 20 people found that the overall level is more average equal to 4.33 standard deviation is equal to 0.63 of the design is in the level of the average equal to 4.34 and standard deviation is equal to 0.55 to meet the needs of the user system is located in the very level average equal to 4.40 and standard deviation is equal to 0.54 Performance Level is more average equal to 4.36 and standard deviation is equal to 0.59 the security of the system is in the level of the average equal to 4.25 and standard deviation is equal to 0.62