After a short flight returning from a maintenance check with a passenger(one of my first), we approach ZBAA as I have done on many previous occasions. We reported Three miles east of the field as requested and were given a downwind joining for runway 04 left-hand circuit. Being used to taking off and returning from runway 22, the prevalent runway, I steered the aircraft at the 04 numbers, crossed and turned right onto downwind for runway 22. On the inbound approach to the 04 numbers, the windy weather conditions were making the aircraft more difficult to control than I was used to, as an inexperienced and, hence, sometimes nervous pilot, this took the greater proportion of my mental capacity. Also, I was preoccupied with my passenger who was having difficulty hearing due to a medical hearing problem, which was compounded by technical intercom difficulties. He was taking photographs and I could see arm movements in the corner of my eye, which were distracting. After flying the downwind leg for 22 right-hand, the Tower controller asked me if I was sure I was downwind left hand for 04. I went over his words in my head and then realized my positional error. I immediately informed him, I have made a mistake, I am late downwind right-hand for runway 22. I asked him what he wanted me to do and I was instructed to turn the aircraft through 180 degrees and take up a position downwind left-hand for runway 04. I did this and, after a short radiotelephony apology, landed, taxied and shut down without further incident.2.When returning to the airport, the pilot was asked to（ ） .