In late fifteen century, witch-hunting craze started in Europe. From the middle of sixteen century to seventeen century it reached the high peak. In England, the main region of witch trials were located mainly in southeaster region, with Lancashire as the only location in the northwester part. Yet scholars of witch-trials studies were interested by cases in Lancashire for two reasons. Firstly, the clerk of the court, Thomas Potts published The Wonderful Discoverie of Witches in the Countie of Lancaster that detailed the witch trial in the Lancashire of the Pendle Forest in 1612. Later, this book became the textbook of the England witch trial. Secondly, the Lancashire took place twenty cases of witch trial in 1612, it was the most important case in the England at the same year, and it also concerned more than thirty people in the consequent witch trial in 1633. Therefore, to explore the witch trial of Lancashire of the Pendle Forest in 1612, meant to have a better understanding of the witch trial of England. In this paper, I meant to analysis Thomas Potts's book in order to discover the process and results of these witch trials, hoping to contribute some new aspects upon the study of the relation between the witch trial and society.