Because of the economic depression in 2008, many corporations laid off employees to decrease their salary cost. By doing so, companies could only reduce their expenditure but could not increase their income. It is more important and might be the best strategy to tap new resources and economize on expense at the same time. Therefore, more companies started to pay much attention to promote their products, and to place importance on salespeople. The objective is to discuss the relationship between personality, sales skill, selling-customer orientation and sales performance of part-time salespeople. This thesis is conducted through opinion survey, relied by part-time salespeople in integrated marketing company; the findings of the thesis can be summarized as follows: 1.The ¡§big five model¡¨ impacts ¡§sales skill¡¨ positively. 2.The ¡§big five model¡¨ impacts ¡§selling orientation¡¨ positively, and impacts ¡§customer orientation¡¨ partially. 3.The ¡§big five model¡¨ impacts the ¡§sales performance¡¨ partially. 4.¡§Sales skill¡¨ impacts the ¡§sales performance¡¨ positively. 5.¡§Selling-customer orientation¡¨ impacts the ¡§sales performance¡¨ positively.