Not only election is one of the significant issues in democratic societies, but also it can be used in commercial association such as stock market and it has a noteworthy feature to determine the board of the directors. According to progresses in cryptographic topics and asymmetric encryption systems, tremendous attempts have been made in the design of protocols for electronic elections. However, all of the designed protocols have either high complexity or weaknesses in security features. Since the majority of electronic election schemes are dependent on a number of honest persons, they are practically difficult. In addition, in most of them, voters will play a key role in producing ballot. If someone imposes compulsory, privacy will be lost or the voter will be able to provide a receipt to show the content of his vote, and this in turn, vote-buying and immoral issues will be appeared. 
In this paper after, evaluating the security features of an electronic election scheme, an election protocol based on homomorphic encryption, will be expressed, and  the difference between the receipt  protocol and receipt-free protocol will be  examined.