Blockchain,　as　the　underlying　technology　of　crypto-currencies,　has　attracted　significant　attention.　It　has　been　adopted　in　numerous　applications,　such　as　smart　grid　and　Internet-of-Things.　However,　there　is　a　significant　scalability　barrier　for　blockchain,　which　limits　its　ability　to　support　services　with　frequent　transactions.　On　the　other　side,　edge　computing　is　introduced　to　extend　the　cloud　resources　and　services　to　be　distributed　at　the　edge　of　the　network,　but　currently　faces　challenges　in　its　decentralized　management　and　security.　The　integration　of　blockchain　and　edge　computing　into　one　system　can　enable　reliable　access　and　control　of　the　network,　storage,　and　computation　distributed　at　the　edges,　hence　providing　a　large　scale　of　network　servers,　data　storage,　and　validity　computation　near　the　end　in　a　secure　manner.　Despite　the　prospect　of　integrated　blockchain　and　edge　computing　systems,　its　scalability　enhancement,　self　organization,　functions　integration,　resource　management,　and　new　security　issues　remain　to　be　addressed　before　widespread　deployment.　In　this　survey,　we　investigate　some　of　the　work　that　has　been　done　to　enable　the　integrated　blockchain　and　edge　computing　system　and　discuss　the　research　challenges.　We　identify　several　vital　aspects　of　the　integration　of　blockchain　and　edge　computing:　motivations,　frameworks,　enabling　functionalities,　and　challenges.　Finally,　some　broader　perspectives　are　explored.