Judge Alistair McCreath, sitting at Southwark crown court, granted Patrick Rock bail until trial date in May.
Rock was originally charged back in June 2014 with three counts of making an indecent photograph of a child in August 2013. He was also charged with possession of 59 indecent images of children.
Mr Rock was one of David Camerons closest aids and was one of the government’s advisers on policy for online pornography filters.
Mr Rock resigned as a policy adviser to Mr Cameron after he was arrested.
The former deputy head of the No 10 Policy Unit has been close to Mr Cameron for two decades. The two men worked for Michael Howard when he was Home Secretary in the 1990s.
In Downing Street, he had the title of deputy director of policy and worked across a wide range of topics, including the government’s policy on child pornography. His seniority was demonstrated by the fact that he was one of only three advisers given his own private office in No 10.
Mr Rock is denying the claims.