Hi, is there a bus service from beijing to erianhot(mongolia border) & xilinhot to chifeng. time schedule,station departure & fare please.

I am not very clear about the places called erianhot.
As far as I know, from BJ, there are direct buses to reach Xilihot from BJ Liuliqiao and Yongdingmen Bus Stations. The bus fare is around 220 to 280RMB.
To reach CF, both buses and trains exist. The bus fare is 150RMB and takes about 8 hours on the way. The buses leave from Sihui Bus Station at 08:00, 11:00 and 16:30 and from Liuliqiao at 10:30, 16:00, 17:00, 17:30 and 19:00.
From Xilinhot to CF, the buses leave at 06:20 and 08:20. The buses take about 6 to 7 hours.